static VsoHash()
{
using (var emptyStream = new MemoryStream())
{
OfNothing = CalculateBlobIdentifierWithBlocks(emptyStream);
}
}
public static async Task <BlobIdentifierWithBlocks> CalculateBlobIdentifierWithBlocksAsync(Stream stream)
{
BlobIdentifierWithBlocks result = null;
await WalkBlocksAsync(
stream,
blockActionSemaphore : null,
multipleBlocksInParallel : false,
singleBlockCallback : (block, blockLength, blobIdWithBlocks) =>
{
result = blobIdWithBlocks;
return(Task.FromResult(0));
},
multipleBlockCallback : (block, blockLength, blockHash, isFinalBlock) => Task.FromResult(0),
multipleBlockSealCallback : blobIdWithBlocks =>
{
result = blobIdWithBlocks;
return(Task.FromResult(0));
}).ConfigureAwait(false);
if (result == null)
{
throw new InvalidOperationException($"Program error: {nameof(CalculateBlobIdentifierWithBlocksAsync)} did not calculate a value.");
}
return(result);
}
public static BlobIdentifierWithBlocks CalculateBlobIdentifierWithBlocks(Stream stream)
{
BlobIdentifierWithBlocks result = null;
WalkBlocks(
stream,
blockActionSemaphore: null,
multipleBlocksInParallel: false,
singleBlockCallback: (block, blockLength, blobIdWithBlocks) =>
{
result = blobIdWithBlocks;
},
multipleBlockCallback: (block, blockLength, blockHash, isFinalBlock) =>
{
},
multipleBlockSealCallback: blobIdWithBlocks =>
{
result = blobIdWithBlocks;
});
if (result == null)
{
throw new InvalidOperationException("Program error: did not calculate a value.");
}
return(result);
}
public static async Task <BlobIdentifierWithBlocks> WalkAllBlobBlocksAsync(
Stream stream,
SemaphoreSlim blockActionSemaphore,
bool multipleBlocksInParallel,
MultipleBlockBlobCallbackAsync multipleBlockCallback,
long?bytesToReadFromStream = null)
{
bytesToReadFromStream = bytesToReadFromStream ?? (stream.Length - stream.Position);
BlobIdentifierWithBlocks blobIdWithBlocks = default(BlobIdentifierWithBlocks);
await WalkMultiBlockBlobAsync(
stream,
blockActionSemaphore,
multipleBlocksInParallel,
multipleBlockCallback,
computedBlobIdWithBlocks =>
{
blobIdWithBlocks = computedBlobIdWithBlocks;
return(Task.FromResult(0));
},
bytesToReadFromStream.GetValueOrDefault()).ConfigureAwait(false);
return(blobIdWithBlocks);
}
private static async Task WalkMultiBlockBlobAsync(
Stream stream,
SemaphoreSlim blockActionSemaphore,
bool multiBlocksInParallel,
MultipleBlockBlobCallbackAsync multipleBlockCallback,
MultipleBlockBlobSealCallbackAsync multipleBlockSealCallback,
long bytesLeftInBlob)
{
var rollingId = new RollingBlobIdentifierWithBlocks();
BlobIdentifierWithBlocks blobIdentifierWithBlocks = null;
var tasks = new List <Task>();
do
{
await ReadBlockAsync(
stream,
blockActionSemaphore,
bytesLeftInBlob,
async (blockBufferHandle, blockLength, blockHash) =>
{
bytesLeftInBlob -= blockLength;
bool isFinalBlock = bytesLeftInBlob == 0;
try
{
if (isFinalBlock)
{
blobIdentifierWithBlocks = rollingId.Finalize(blockHash);
}
else
{
rollingId.Update(blockHash);
}
}
catch
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
throw;
}
Task multiBlockTask = Task.Run(async() =>
{
try
{
await multipleBlockCallback(blockBufferHandle.Value, blockLength, blockHash, isFinalBlock).ConfigureAwait(false);
}
finally
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
}
});
tasks.Add(multiBlockTask);
if (!multiBlocksInParallel)
{
await multiBlockTask.ConfigureAwait(false);
}
}).ConfigureAwait(false);
}while (bytesLeftInBlob > 0);
await Task.WhenAll(tasks).ConfigureAwait(false);
await multipleBlockSealCallback(blobIdentifierWithBlocks).ConfigureAwait(false);
}
private static void WalkMultiBlockBlob(
Stream stream,
SemaphoreSlim blockActionSemaphore,
bool multiBlocksInParallel,
MultipleBlockBlobCallback multipleBlockCallback,
MultipleBlockBlobSealCallback multipleBlockSealCallback,
long bytesLeftInBlob)
{
var rollingId = new RollingBlobIdentifierWithBlocks();
BlobIdentifierWithBlocks blobIdentifierWithBlocks = null;
Lazy <List <Task> > tasks = new Lazy <List <Task> >(() => new List <Task>());
do
{
ReadBlock(
stream,
blockActionSemaphore,
bytesLeftInBlob,
(blockBufferHandle, blockLength, blockHash) =>
{
bytesLeftInBlob -= blockLength;
bool isFinalBlock = bytesLeftInBlob == 0;
try
{
if (isFinalBlock)
{
blobIdentifierWithBlocks = rollingId.Finalize(blockHash);
}
else
{
rollingId.Update(blockHash);
}
}
catch
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
throw;
}
if (multiBlocksInParallel)
{
tasks.Value.Add(Task.Run(() =>
{
try
{
multipleBlockCallback(blockBufferHandle.Value, blockLength, blockHash, isFinalBlock);
}
finally
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
}
}));
}
else
{
try
{
multipleBlockCallback(blockBufferHandle.Value, blockLength, blockHash, isFinalBlock);
}
finally
{
CleanupBufferAndSemaphore(blockBufferHandle, blockActionSemaphore);
}
}
});
}while (bytesLeftInBlob > 0);
if (tasks.IsValueCreated)
{
Task.WaitAll(tasks.Value.ToArray());
}
multipleBlockSealCallback(blobIdentifierWithBlocks);
}